dig-capsule 0.5.0

The DIG Network .dig capsule data plane — one crate over the DIGS format, capsule read-crypto, compiler, staging, and the guest/host serve triad.
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use crate::imp::core::codec::section::{SectionEntry, SectionHeader, DIGS_MAGIC, FORMAT_VERSION};
use crate::imp::core::codec::{Decode, Encode};

#[test]
fn header_starts_with_magic_and_version() {
    let header = SectionHeader {
        format_version: FORMAT_VERSION,
        entries: vec![
            SectionEntry {
                id: 1,
                offset: 100,
                length: 50,
            },
            SectionEntry {
                id: 2,
                offset: 150,
                length: 25,
            },
        ],
    };
    let bytes = header.to_bytes();
    assert_eq!(&bytes[0..4], DIGS_MAGIC);
    assert_eq!(bytes[4], FORMAT_VERSION);
}

#[test]
fn header_offset_table_roundtrip() {
    let header = SectionHeader {
        format_version: FORMAT_VERSION,
        entries: vec![
            SectionEntry {
                id: 7,
                offset: 0,
                length: 4096,
            },
            SectionEntry {
                id: 9,
                offset: 4096,
                length: 1024,
            },
        ],
    };
    let bytes = header.to_bytes();
    let decoded = SectionHeader::from_bytes(&bytes).unwrap();
    assert_eq!(decoded, header);
}

#[test]
fn header_rejects_bad_magic() {
    let mut bytes = SectionHeader {
        format_version: FORMAT_VERSION,
        entries: vec![],
    }
    .to_bytes();
    bytes[0] = b'X';
    assert!(SectionHeader::from_bytes(&bytes).is_err());
}

#[test]
fn header_rejects_unknown_version() {
    let mut bytes = SectionHeader {
        format_version: FORMAT_VERSION,
        entries: vec![],
    }
    .to_bytes();
    bytes[4] = 99;
    assert!(SectionHeader::from_bytes(&bytes).is_err());
}

#[test]
fn lookup_finds_section_by_id() {
    let header = SectionHeader {
        format_version: FORMAT_VERSION,
        entries: vec![
            SectionEntry {
                id: 3,
                offset: 10,
                length: 20,
            },
            SectionEntry {
                id: 5,
                offset: 30,
                length: 40,
            },
        ],
    };
    assert_eq!(header.find(5), Some((30, 40)));
    assert_eq!(header.find(99), None);
}